Fail
public struct Fail<Element, Failure> : AsyncSequence where Failure : Error
extension Fail: AsyncIteratorProtocol
An asynchronous sequence that immediately throws an error when iterated.
let stream = Fail<Int, TestError>(error: TestError())
do {
for try await value in stream {
print(value)
}
} catch {
print("Error!")
}
// Prints:
// Error!
-
Creates an async sequence that throws an error.
Declaration
Swift
public init(error: Failure)
Parameters
error
The error to throw.
-
next()
AsynchronousProduces the next element in the sequence.
Declaration
Swift
public mutating func next() async throws -> Element?
Return Value
The next element or
nil
if the end of the sequence is reached. -
Creates an async iterator that emits elements of this async sequence.
Declaration
Swift
public func makeAsyncIterator() -> Fail<Element, Failure>
Return Value
An instance that conforms to
AsyncIteratorProtocol
.